Erin listened at the Professor's discussion about Muggle fairytales' protagonists and antagonists. And she caught that confusion of Professor Cerulean about the black and white costumes of the bad guy and good guy respectively on the video she just showed them. In Muggle beliefs, white usually represents the good one and black is the white one. As Erin grew accustomed to the wizarding practice, she had also observed that blacks were the usual colors in this world.

Why was it taking the picnic basket so long to reach her place? She wanted one.

...and the question. Erin raised her hand and shared her answer, "There is the famous Muggle movie, Toy Story. It's a series but my favorite is Toy Story 3. The protagonists are Woody, Buzz Light Year and all their other toy friends while the antagonist is Lotso. They are donated by accident to the Sunnyside Daycare. The toys are welcomed by Lotso but sooner they discover that the children mistreat them. Further, they are imprisoned in the daycare by Lotso and his gang."